doku-derive 0.21.2

A framework for building documentation (internal macro)
Documentation 
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use crate::prelude::*;
use darling::FromMeta;

/// Models the `#[serde]` attribute for variants:
///
/// ```ignore
/// enum Foo {
///     #[serde(rename = "BAR")]
///     Bar,
/// }
/// ````
#[derive(Clone, Debug, Default, FromMeta)]
#[allow(dead_code)]
pub struct SerdeVariant {
    #[darling(default, multiple)]
    pub alias: Vec<syn::LitStr>,

    #[darling(default)]
    pub deserialize_with: Option<syn::Meta>,

    #[darling(default)]
    pub other: Option<syn::Meta>,

    #[darling(default)]
    pub rename: Option<syn::LitStr>,

    #[darling(default)]
    pub rename_all: Option<RenameRule>,

    #[darling(default)]
    pub serialize_with: Option<syn::Meta>,

    #[darling(default)]
    pub skip: Option<bool>,

    #[darling(default)]
    pub skip_deserializing: Option<bool>,

    #[darling(default)]
    pub skip_serializing: Option<bool>,

    #[darling(default)]
    pub with: Option<syn::LitStr>,
}

impl SerdeVariant {
    pub fn from_ast(attrs: &[syn::Attribute]) -> Result<Self> {
        attrs::from_ast(attrs, "serde")
            .map(|attrs| attrs.fold(Self::default(), Self::merge))
    }

    pub fn merge(self, mut other: Self) -> Self {
        let mut alias = self.alias;
        alias.append(&mut other.alias);
        Self {
            alias,
            deserialize_with: None, // it's a no-op for us
            other: None,            // it's a no-op for us
            rename: other.rename.or(self.rename),
            rename_all: other.rename_all.or(self.rename_all),
            serialize_with: None, // it's a no-op for us
            skip: other.skip.or(self.skip),
            skip_deserializing: other
                .skip_deserializing
                .or(self.skip_deserializing),
            skip_serializing: other.skip_serializing.or(self.skip_serializing),
            with: None, // it's a no-op for us
        }
    }
}